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Finding the Fourth Proportional to 707.73, 1,055.91 and 629.76

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Solution

The fourth proportional to 707.73, 1,055.91 and 629.76 is: 939.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.73 : 1,055.91 = 629.76 : x
  2. Step 2: Convert to fraction form
    707.73/1,055.91 = 629.76/x
  3. Step 3: Cross multiply
    707.73x = 1,055.91 × 629.76
  4. Step 4: Simplify right side
    707.73x = 664,969.88
  5. Step 5: Solve for x
    x = 664,969.88/707.73
  6. Step 6: Final answer
    x = 939.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.